/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include <svx/e3dsceneupdater.hxx>
#include <drawinglayer/geometry/viewinformation3d.hxx>
#include <svx/obj3d.hxx>
#include <svx/scene3d.hxx>
#include <svx/sdr/contact/viewcontactofe3dscene.hxx>


E3DModifySceneSnapRectUpdater::E3DModifySceneSnapRectUpdater(const SdrObject* pObject)
:   mpScene(nullptr)
{
    // Secure old 3D transformation stack before modification
    const E3dObject* pE3dObject = dynamic_cast< const E3dObject* >(pObject);
    if(!pE3dObject)
        return;

    mpScene = pE3dObject->getRootE3dSceneFromE3dObject();

    if(nullptr == mpScene || mpScene->getRootE3dSceneFromE3dObject() != mpScene)
        return;

    // if there is a scene and it's the outmost scene, get current 3D range
    const sdr::contact::ViewContactOfE3dScene& rVCScene = static_cast< sdr::contact::ViewContactOfE3dScene& >(mpScene->GetViewContact());
    const basegfx::B3DRange aAllContentRange(rVCScene.getAllContentRange3D());

    if(aAllContentRange.isEmpty())
    {
        // no content, nothing to do
        mpScene = nullptr;
    }
    else
    {
        // secure current 3D transformation stack
        mpViewInformation3D = rVCScene.getViewInformation3D(aAllContentRange);
    }
}

E3DModifySceneSnapRectUpdater::~E3DModifySceneSnapRectUpdater()
{
    if(!(mpScene && mpViewInformation3D))
        return;

    // after changing parts of the scene, use the secured last 3d transformation stack and the new content
    // range to calculate a new, eventually expanded or shrunk, 2D geometry for the scene and apply it.
    // Get new content range
    const sdr::contact::ViewContactOfE3dScene& rVCScene = static_cast< sdr::contact::ViewContactOfE3dScene& >(mpScene->GetViewContact());
    basegfx::B3DRange aAllContentRange(rVCScene.getAllContentRange3D());

    // only change when there is still content; else let scene stay at old SnapRect
    if(aAllContentRange.isEmpty())
        return;

    // check if object transform of scene has changed
    if(mpViewInformation3D->getObjectTransformation() != mpScene->GetTransform())
    {
        // If Yes, it needs to be updated since it's - for historical reasons -
        // part of the basic 3d transformation stack of the scene
        mpViewInformation3D = drawinglayer::geometry::ViewInformation3D(
            mpScene->GetTransform(), // replace object transformation with new local transform
            mpViewInformation3D->getOrientation(),
            mpViewInformation3D->getProjection(),
            mpViewInformation3D->getDeviceToView(),
            mpViewInformation3D->getViewTime(),
            mpViewInformation3D->getExtendedInformationSequence());
    }

    // transform content range to scene-relative coordinates using old 3d transformation stack
    aAllContentRange.transform(mpViewInformation3D->getObjectToView());

    // build 2d relative content range
    basegfx::B2DRange aSnapRange(
        aAllContentRange.getMinX(), aAllContentRange.getMinY(),
        aAllContentRange.getMaxX(), aAllContentRange.getMaxY());

    // transform to 2D world coordinates using scene's 2D transformation
    aSnapRange.transform(rVCScene.getObjectTransformation());

    // snap to (old) integer
    const tools::Rectangle aNewSnapRect(
        sal_Int32(floor(aSnapRange.getMinX())), sal_Int32(floor(aSnapRange.getMinY())),
        sal_Int32(ceil(aSnapRange.getMaxX())), sal_Int32(ceil(aSnapRange.getMaxY())));

    // set as new SnapRect and invalidate bound volume
    if(mpScene->GetSnapRect() != aNewSnapRect)
    {
        mpScene->SetSnapRect(aNewSnapRect);
        mpScene->InvalidateBoundVolume();
    }
}

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